brief runs vs lengthy runs

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Posted on by khumphries1

I have a flow that syncs two SharePoint lists. The process is a bit inefficient, as it involves

building an array of all items from a source list (approx. 4800 items)
then building an array of all items from the target list (approx. 4800 items)
then creating a intersection of the two datasets to determine what's already in sync
then looping through the target array output to delete items not in the intersection
then looping through the target array output to create new or modified items not in the intersection

but, it works!

I have two versions of this flow:

1) a Button flow

2) a Scheduled flow

The Button flow completes in 2.5 hours, give or take a few minutes.

The very same flow started on a Schedule requires anywhere from 12 to 36 hours.

Who can explain this?